Extendable boat trailer hitch



FIG. 1 is a front elevational view of the extendable boat trailer hitch showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a front elevational view thereof showing the hitch in use, the broken lines are shown for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an extendable boat trailer hitch, as shown and described. 